Chinese (or other country) sai/parrying weapon

[Gavin Nugent]

I bought this quite some time ago in a box lot of Tibet and Mongolian knives and trousse and upon playing with it recently, it is a most effective and destructive little item...the question is, is it actually a weapon, i.e; an iron ruler or something else like a sharpening steel?

It is just under 34.5cms long. the grip is rectangular and shaped for fitment in the hand. The "blade" for want of a better word is thicker and broader than the handle and an elliptical cross section and a tapering tip...no sharp edges, just effective blunt force trauma.
POB is at the half way mark, which is putting all the weight forward but little to no effort in the hand.

Gavin